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Finding the Fourth Proportional to 13,612.98, 20,406.50 and 4,372.50

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Solution

The fourth proportional to 13,612.98, 20,406.50 and 4,372.50 is: 6,554.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,612.98 : 20,406.50 = 4,372.50 : x
  2. Step 2: Convert to fraction form
    13,612.98/20,406.50 = 4,372.50/x
  3. Step 3: Cross multiply
    13,612.98x = 20,406.50 × 4,372.50
  4. Step 4: Simplify right side
    13,612.98x = 89,227,421.25
  5. Step 5: Solve for x
    x = 89,227,421.25/13,612.98
  6. Step 6: Final answer
    x = 6,554.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.